package lab01;

import java.util.Scanner;

public class Text05 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int grade=sc.nextInt();

        switch(grade) {
            case 1:
                System.out.println("不及格");
                break;
            case 2:
                System.out.println("及格");
                break;
            case 3:
                System.out.println("中等");
                break;
            case 4:
                System.out.println("良好");
                break;
            case 5:
                System.out.println("优秀");
                break;
            default:System.out.println("   ");
        }
    }
}
